Syringe



, .1,541,615 A. N. BESSESEN SYRIINGE Filed Aug. 6, 1923 F le. l. 2120 5 J6' j .1r I

FIG. 2

Patented June 9, 1925.

` *Ansinnen B'assas'nn'or ninnaarotrs,*ivnunnsomf Simmern. i'

Application-mea August 6,1923. sehen No. 656,087.'

To @ZZ whom t may concern.:

Beit knownthatJ I, ALFRED 1T.k BnssnsnN, a. citizen of the United States of America, residing at Minneapolis, in the county of 5 Hennepin and Stateof Minnesota., have-invented certain new and useful Improvements in Syringes, of which the following is a specification.

kThis invention relates to new anduseful improvements in syringes bestadapted .for

use .to produce local anesthesia., Y

- An important object o-f vthe invention is to provide a syringe of the above mentioned type which is operated -b'y air or gas pressure. y n i A further object of the invention Iis -to provide a syringe -that 'is suitably constructed for permitting a high pressure to Vbe maintained therein over a considerable $0 period of time. y

A `further object of fthe' vinvei'ition is to vprovide aV Tlocalanesthesia syringe which may be used for inltration, under known pressure, of -body'tifssues for surgical purposes.l v'

A further object of the-invention is .to provide a-'syri-nge' which requires verylittle effort A'tooperate.. .Y f

A` still furtherob'ect of; the invention is to provide a device of Ithe above mentioned type which may -be-used quickly, promptly, and safely'for ,producing local anesthesia.

4Other objects and advantages of the in'- vention will be apparent #during the-course of the following description.

- In the .accompanying'drawing form-ing a part yof this-specification 'and in which like numerals arefemploj-yed to designate like parts throughout the same, l 40 Figure lis a longitudinal sectional view, partly in elevation, of the syringe embody- Y ing thisinvention, f f

Figure 2 is a. fragmentary sectional view of a po'rtion `of the needle `carrying end of the syringe shown in Fig. 1, and

Figure 3 is a longitudinal sectional view' of the needle employed.

In the drawing, wherein for the purpose of .illustration is sho-wn a preferred embodiment of this invention, the numeral 5 designates the rear end section of the barrel or body portion of the syringe. This section 5 is externally screw threaded at its inner end for threadedly engaging' the cap 6 05' which carries a nip-ple 7 having' the pressure gage 8 suitably carried thereby and a hose connection@ havingr acheclrvalvfe 1"() located therein Ifor` allowing the entrance of a suitable fluid under -p-ressureinto Vthe barrel or -bodyportion 'of tlre'device. The opposite `end ofthe ibarrel section 5 is externally -fscrefw ythreaded -fo-r detachably being connected'to the l'enlargedcollar portion .11 of the outer y"end section i12/*of the barrel or body. Thisthreaded end `of the ybodyor barrel 'Section5 is A'pro-vided with 'a tapered edge 13 that f is adapted 'to seat against a simil arly shaped lsiii-face yformed iin "the vvenlarged collarfll of tliebarrel y'section 12. The outer end of this barrel -section V12 Lis externally fscrewrthreaded for engaging "the -cap 14 which is provided withfan'farcuately formed nozzle :portion '15. f The fsaidcap li and nozzle portion flxa're fprovided 'with a passage 16 having `a tapered valve seatV 15T formed at lits inner rfenfd thatis adapted for being engaged by the"conically-shaped valve element' 18 which *is A'controlled by the push 'button`1f9 having a Vcoil spring 2O @for 'nor- -mally retainingfit vin its inoperative :position and for "retainingfthe valve element "18 againstfthe seat 117 This push button 19 is provided with fa shank .portion 21' having a "cone-'shaped valve surface `22` that is adapted for seating again-st the valve seat23 which is formed 'in thelouter Vend of thevalve'rod.

open'n-gli. Thefextreme outer end of Jthe y nozzle fp'ortio'n 15 is externally screw threaded ffor ldetachably receiving 'the needle clamping collar 25fwhi'ch carriesthe needle 26 and is adapted -Lfor aliningwthe bore '27 of the needle with thelp'ass'age lf'forme'dd'n the cap 14; and nozzle 15.

It will Sb'e `noticed"by vinspecting Fig. 1, that both of the barrel sections 5 'and 12 have bores'of fequa'l ydia-meter for the .purpose of accommodating ythe,-pressu're operated pis'- ton 28 vwhich,Ei's'provided with tal stein Sportion 29 having Sat its 'outer 'end a handle iper- 'tion130;:.y f A l .A

The operation of the syringe embodying this invention is as follows f Thebarrel or body section 5 is' detached from the section '12 and the pressure operated piston 28 is removed from the latter section by grasping the handle portion 30. The barrel section 12 is then filledv with a suitable anesthesia producing drug. The pressureoperated piston 28 is then placed within the barrel section 5 and the two sections are threadedly connected. It is to be understood that the connection 9 carried by the cap 6 isV connected to a suitable source of supply, such as.- a gas or airvpressure pump. This gas or air pressure may then be operated for producing a desired pressure within the entire barrel section of the syringe, the said pressure therewithin be ing recorded upon the gage 8. It will be seen that the valve element 18 will prevent the outward passage of the drug 31 which is positioned Vwithin the barrel section 12. IVhen a surgeon'yor other suitable person, desires` to infiltrate certain body tissues for `producing local anesthesia, it is-merely necessary for him to properly insert the needle 26 into the tissues and press the button 19 for unseating the valve element 18. The pressurewithin the barrel section of the syringe will cause the piston 28 to move longitudinally thereof for forcing the drug 31 through the passage 16 and through the bore 27 of the needle. The valve 22 will engage the valve seat 23 when the button 19 is pressed inwardly and will thereby prevent 'the escapement of the'anesthesial producing drug through the valve stem opening 24. .It is very apparent that the construction of this syringe allows for the maintaining of a very high pressure Within the same and that this pressure may be maintained for-any desired length of time. The operation of the valve element 18 for allowing the drug 31 to be. infiltrated into the body tissues will not require any great effort upon the part of the operator and will therefore eliminate any danger of Vbreaking' the needle 26 which very frequently happens when manually operated syringes are employed.

It is to be understood that the form of this invention herewith shown and described isto betaken as the preferred example of the same, and that .various changes in the shape, size, and arrangement of parts may be resorted towithout departing from the spirit of the invention or the scopel of the subjoined claims. f

Having thus described .the invention, I claim I 1. In a syringe, a barrel portion, a removable cap carried by saidV barrel portion, said cap having a passage therethrough, a conical valve seatv formed in said cap at one end of said passage, said cap having an opening extending therethroughk from the valve seat, a second valve seat formed in said cap at the outer end of said opening, a rod movably positioned in said opening, a valve element carried by each end of said rod adapted to engage said valve seats one at a time, means associated with said rod for normally retaining one of said valves in engagement with the first mentioned valve seat for closing said passage, and kmeans carried by said rod for unseating this last mentioned valve and for seating the other va ve.

removably carried thereby, `said cap having an opening therethrough, a conical valve seat formed at each end of said opening, said cap having a `passage extending therethrough and' opening into the wall of the valve seat at the inner endof said opening,` a rod' slidably positioned within said opening and having a length greater than that of the opening, a valve element carried byeach end of said rod, meansffor normally retaining the valve-element at the inner end of said rod seated for closing said passage, means formanually unseating the valve element at the inner end of said rod 2. In a syringe, a barrel portion, a Acap and seating the valve element atvthe outer end of said rod, and a hypodermic needle removably carried by said cap incommunication with the outer end of said passage.

3. Ina syringe, a barrel portion, a removablecap carried thereby, said cap having an openingtherethrough, a conical valve seat formed at each Vend of said opening, said cap having a passage extending therethrough and opening into ,the wall of the valve seat at the Ainner end of said `opening, a rod slidably positioned within said opening and 'having a length greater than that of the opening, a valve element` carried by each end of said rod,'resilient means for normally retaining the valve elementvat ALFRED n. nns`snsuu 

